Influence of Magnetic Field on the Electrodeposition and Capacitive Performances of MnO₂

• Published in: Magnetochemistry
• Main Authors: Aldo Girimonte, Andrea Stefani, Massimo Innocenti, Claudio Fontanesi, Roberto Giovanardi
• Format: Article
• Language: English
• Published: MDPI AG 2021-01-01
• Subjects: supercapacitor; manganese dioxide; electrodeposition; magnetohydrodynamics; magnetohydrodynamic (MHD); pseudocapacitor
• Online Access: https://www.mdpi.com/2312-7481/7/2/19
• ISSN: 2312-7481

This study focuses on the influence of an applied external magnetic field on the electrodeposition process and capacitive performances of MnO<inline-formula><math display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>, as pseudo-capacitive active material for supercapacitors electrodes. MnO<inline-formula><math display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> was electrochemically deposited on Si/Au substrates in the presence and in the absence of a 0.5 T magnet, and its capacitive performance was tested via electrochemical characterization. The samples obtained in the presence of the magnetic field show a positive influence on the deposition process: the increase in deposition efficiency leads to more compact and uniform MnO<inline-formula><math display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> coatings, with a decrease in capacitance values for the samples produced with the magnetic field.